diff --git a/packages/devextreme/js/__internal/ui/chat/chat.ts b/packages/devextreme/js/__internal/ui/chat/chat.ts
index 8b54e8d167c8..fecd6c0da719 100644
--- a/packages/devextreme/js/__internal/ui/chat/chat.ts
+++ b/packages/devextreme/js/__internal/ui/chat/chat.ts
@@ -64,14 +64,13 @@ class Chat extends Widget<Properties> {
   }
 
   _renderMessageList(): void {
-    const { items = [], dataSource, user } = this.option();
+    const { items = [], user } = this.option();
 
     const currentUserId = user?.id;
     const $messageList = $('<div>').appendTo(this.element());
 
     this._messageList = this._createComponent($messageList, MessageList, {
       items,
-      dataSource,
       currentUserId,
     });
   }
@@ -160,6 +159,6 @@ class Chat extends Widget<Properties> {
   }
 }
 
-registerComponent('dxChat', Chat as ComponentFactory<Chat>);
+registerComponent('dxChat', Chat as unknown as ComponentFactory<Chat>);
 
 export default Chat;
diff --git a/packages/devextreme/js/core/component_registrator.d.ts b/packages/devextreme/js/core/component_registrator.d.ts
index c9637a60890d..3676d7fcc739 100644
--- a/packages/devextreme/js/core/component_registrator.d.ts
+++ b/packages/devextreme/js/core/component_registrator.d.ts
@@ -1,7 +1,7 @@
 import DOMComponent from './dom_component';
 import { UserDefinedElement } from './element';
 
-type ComponentFactory<TComponent> = {
+export type ComponentFactory<TComponent> = {
     new(element: UserDefinedElement, options?: Record<string, unknown>): TComponent;
     getInstance(element: UserDefinedElement): TComponent;
 };